The Grand Canyon has amazed visitors and scientist alike since it was discovered. The debate over what created this geologic wonder has been reignited in recent years. Is the Grand Canyon 6 million years old or 70 million? Listen to learn more about this debate between two geologists who have very opposing viewpoints.
Story Length: 4:09
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Giant volcanoes appear every few million years, and their eruptions are rare, but they are deadly. The ash and gas released into the atmosphere have the potential for significant harm. So scientists are studying two new suspected volcanic “hot spots" and are trying to figure out why they erupt. Listen to learn how seismic waves give scientists a picture of the large regions where intense volcanic activity could develop in the distant future.
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Archeologists have long searched sites across Central America to learn about the ancient civilizations that once thrived there. One of those civilizations is the Olmecs, an early Central American people, whose culture pre-dates the Mayans. In this audio story you will hear about the discovery of a stone block that seems to date back to the Olmecs, over 3,000 years ago. It contains what might be the oldest writing ever found in the Americas. Listen to learn more about the significance of this discovery.
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